Feed device for woodworking machines especially planing machines



May 24, 1960 H. HELLE 2,937,674

FEED DEVICE FOR WOODWORKING MACHINES ESPECIALLY PLANING MACHINES FlledNov. 29, 1957 2 Sheets-Sheet 1 .-lllmmy May 24, 1960 H. HELLE FEEDDEVICE FCR wooDwoRxINC MACHINES ESPECIALLY PIANINC MACHINES 2Sheets-Sheet 2 Filed NOV. 29, 1957 FEED DEVICE Fon wooDwoRKINGMAcnnslEsv ESPECIALLY PLANING MACHINES Heinz Helle, Jonsdorf, Saxony,Germany, assignor to VEB Maschinenbau Jonsdorf, Jonsdorf, Saxony,Germany Filed Nov. 29, 1957, Ser. No. 699,637 Claims priority,application Germany Feb. 22, 1957 7 Claims. (Cl. 144247) This inventionrelates to woodworking machines an more particularly to a feed devicetherefor.

Various types of feed devices have, heretofore, been provided forwoodworking machines. However, in 'some of these devices the feed rollsare arranged on shafts supported in guided parallel' relationship witheach other upon vthe table top, each being arranged to swing freely f'machine table and over the cutting tool so that the work pieces, whileybeing properly planed when leaving the machine, nevertheless distortback to their original warped condition. Y

It is, therefore, an object of the present invention to eliminate thesedisadvantages and, in addition, to provide self contained feed rollspring suspensions that also prevent the work piece from being thrownrearwardly during use of the device.

Other objects of the invention are to provide a feed device forwoodworking machines bearing the above objects in mind which is ofsimple construction, has a minimum number of parts, is inexpensive tomanufacture, and eiiicient in operation.

For other objects and -for a better understanding of the invention,reference may be had to the following detailed description taken inconjunction with the accompanying drawing in which:

Figure l s a longitudinal cross sectional View of a feed device made inaccordance with the present invention;

Figure 2 is a transverse cross sectional view of the apparatus shown inFigure 1;

Figure 3 is a diagrammatic side elevational view illustrating certainmovements of the mechanism; and

Figures 4 through 6 are front elevational views show ing certain partsin variousoperating positions;

Figures 7 and 8 are isometric versions of parts shown in Figures l and2.

In accordance with the present invention, the feed rolls are supportedin a yieldable position that permits them to move perpendicularly andangularly relative to the surface of the work piece so as to conform tothe specific shape and position of distorted work pieces as they aremoved through the woodworking machine. For this purpose, the rolls aresuspended in long, vertical, telescoping spring guides that haveadjustable pressure springs for independently controlling the movementsof each feed roll regardless of which side is raised or lowered duringuse and which also includes obliquely adjusted spring systems whichfurther resist movement of the rolls out of a normal parallelrelationship with each other.

- aforementioned angling movement.

2,937,674 Patented May 24, 1960 Referring now more in detail to thedrawing, a feed device made in accordance with the present' invention isshown to include a vmain base or housing 40 within which the feed rolls1, 2, 3 are supported on hollow bodies 4 and self-aligning ball bearings5 which assure the The hollow bodies 4 are fastened in bearingflanges 6.The guide tubes 7 which are connected with flange 6 are displaceablyheld in guide bushings 8, which Vare acted upon by compression springs9. The spring pressure is Vfurther increased by e spring members 10 thatare arranged obliquely to the main spring suspensions 9'by means oftransversely extending bridges 11 which'simultaneously provide seats forthe vertical spring elements 7, 8, 9.

The driving of each `feed roll is effected by means of aY universaljoint shaft 17 that extends through the hollow body 4 and is connectedwith the feed rolls 1, 2, 3, the drive bearings 18 being rigidlyconnected with the bridge 11. The support 19 of the apparatus incontrast to other feed devices has no threaded spindles for securingitin the desired adjusted position. On the other hand, the stand 19 hasguide shafts 20 which are provided with lat threads so as to effectvertical adjustment of the feed device by means of hand wheels 21. Theapparatus is driven by a reversible pole motor 13 that has two feedspeeds through conventional worm and pinion gears (not shown) andYthrough a chain 14, chain drum 15, and sprocket wheels 16 that areconnected to the universal joint shafts 17 of the feed rolls.

In'actual use, the work piece 30 is placed upon the machine work table25. and moved toward the foremost feed `roll 1 which is raised againstthe action `of the vertical springs as permitted by the self-aligningbearings 5 to the position in which it assumes vthe exact inclination ofthe upper surface of the board 30, one end of the roll being free to beraised higher or lower than the opposite end thereof. Additionalyieldability to the shape of the work piece Vis provided by the obliquebridges 11 which allow `for angular movement of the feed rolls withrespect to the work table. The feed rolls may be moved into a tiltedposition by the distorted work piece by the right hand or left handspring members 7, 8, 9 arranged independently of each other. Theintermediate feed roll 2 operates similarly.

The obliquely set bridges 11 also prevent .the work piece 30 from beingthrown backwardly (i.e. to the right in Fig. 1) by the cutting tool.YThis would endanger property and might cause possible injury to workmen.In the event that suiiicient force urges the work piece in the oppositeor backward direction (to the right in Fig. 1), the bridges 11 and therotating feed rolls are pulled rearwardly (to the right and down) intheir oblique guide 12 by the frictional engagement of the work piecewith the rotating feed rolls 1 and 2.V This clamps the work piece firmlyto the machine table 25 of the machine so as to positively elfect astopping action on such rearward movement.

The elongated yieldable springs 9 permit a cushioning effect without anyconsiderable increase of the supporting pressure of the feed rollsagainst the work piece, which, in a known manner, may be adjusted bysimply tightening or loosening the springs.

While various changes may be made in the detail construction, it shallbe understood that such changes shall be within the spirit and scope ofthe present invention as defined by the appended claims.

What I claim as new and desire to protect by Letters Patent of theUnited States is:

1. Apparatus for feeding workpieces to woodworking feed roll and saidwork face, support means connected to said feed roll for substantiallymaintaining position of said feed roll, yieldable means in said supportmeans biasing said feed roll against said workpiece, guide means in saidsupport means adapted to allow tilting, transverse and obliquedisplacement of said feed roll with respect to said work face inresponse to the shape and movement of said work piece, said guide meansincluding a vertical guide,

member for allowing tilting and transverse displacement of parts mountedthereon and an oblique guide member connected to said vertical member,one of said members supporting said feed roll and the other of saidmembers guiding the first of said members and means in said supportmeans for rotating said feed roll.

2. Apparatus for feeding workpieces to woodworking machines and the likecomprising a work face, support means, a plurality of substantiallyparallel rotatable feed rolls spaced opposite and in parallel relationto said work face adapted to move a work piece between said feed rollsand said work face, said support means connected to said feed rolls forsubstantially maintaining position of said feed rolls, said supportmeans including first guide means adapted to allow for translatory andtilting movement of said feed rolls in a plane transverse to said workface, first resilient means in said first guide means biasing said feedrolls against said work piece, said support means further includingsecond guide means allowing for movement of said first guide meansoblique to said work face and against the direction of the feedingmotion of said workpiece, second resilient means in said second guidemeans adapted to bias said first guide means and said feed rolls againstsaid workpiece in a direction opposing the feeding movement of saidworkpiece, and means in said support means for rotating said feed rolls.

3. An apparatus for feeding workpieces as in claim 2, wherein said feedrolls are adapted to frictionally feed said workpiece, whereby backlashmotion by said' workpiece opposing said feed rolls produces displacementof said feed rolls and said first guide means in the direction of saidWork face to clamp said workpiece to said work face.

4. Apparatus for feeding workpieces as in claim 3, wherein said firstguide means include support bearings at each end of said feed rolls.

5. Apparatus for feedingA workpieces as set forth in claim 4, whereinsaid first resilient means include independent spring means biasing theends of each of said feed rolls to allow tilting of said feed rolls.

6. Apparatus for feeding workpieces as in claim 5, said means forrotating said rolls including universal joint means disposed in saidfeed rolls and adapted to transmit rotation to said rolls.

7. Apparatus for feeding workpieces to woodworking machines and the likecomprising a work face, a rotatable feed roll spaced opposite and inparallel relation to said work face and adapted to move a workpiecebetween said feed roll and said work face, support means for said feedroll, guide means in said support means adapted to allow tilting,translatory-and oblique displacement of said feed roll with respect tosaid work face in response to the shape of said workpiece, said guidemeans including a vertical guide for allowing tilting and translatorymovement of said roller transverse to the direction of said work face`and an oblique guideV for allowing movement of said vertical guide in anoblique-direction with respect to said work face, and means for rotatingsaid feed roll in said support.

References Cited in the tile of this patent UNITED STATES PATENTS1,074,198 Phillips Sept. 30, 1913 1,109,747 Giertsen Sept. 8, 19142,332,888 Bostwick et al. Oct. 26, 1943` 2,819,744 Chuet et al. Jan. 14,1958 2,829,683 Skinner et al. Apr. 8, 1958 FOREIGN PATENTS i 78,097Germany Nov. 19, 1894

